You find yourself standing in the center of a broad, circular room, the walls, floor and domed ceiling made of a strange stone-like substance of an off-white color. In front of you is what appears to be a very large door, made of the same material as everything else, slightly ajar. Next to the door is a silver sphere, hovering a few inches from the ground to the right. It is repeating a message over and over again, the surface vibrating softly as it radiates sound. The voice sounds high, as though spoken by a small child, but is perfectly clear and easy to understand.
"Welcome to the Interdimensional Nexus. Please proceed through the door and into the common house; everything will be explained there. We request that you refrain from violence here. It is not appreciated and will be dealt with harshly."